Linked from
The 11 pages that link to Singlet oxygen, each with the reason it gives.
CarotenoidRelated: Carotenoids quench singlet oxygen before it damages cellular components.
PhotodegradationRelated: It can attack light-exposed polymers, pigments, and biological molecules.
LycopeneRelated: Lycopene can quench singlet oxygen by transferring its excitation energy.
ZeaxanthinRelated: Zeaxanthin can quench this damaging species in plant tissues and the retina.
Allotropes of oxygenRelated: It is an excited state of dioxygen, not a distinct oxygen allotrope.